Anti-mechanical vibration mems accelerometer arrangement, related method, device and system

Abstract

An accelerometer arrangement and method for determining acceleration of a subterranean tool is described. supporting the first triaxial accelerometer and the second triaxial accelerometer such that the vertical sensing axis of the first triaxial accelerometer is at least generally orthogonal to the vertical sensing axis of the second triaxial accelerometer for use based on A combination of the sense axis outputs of one or both of the three-axis accelerometers determines acceleration along three orthogonal axes. The weaker sensing axis of one triaxial accelerometer may be supported at least approximately perpendicular to the weaker sensing axis of the other triaxial accelerometer such that the weaker axis is not used. Three-axis accelerometers may be supported such that one axis of one accelerometer is redundant with respect to the other axis of another accelerometer. One triaxial accelerometer may be mounted on an inclined plane relative to the other triaxial accelerometer.

Description

[0001] related application [0002] This writing requires U.S. Provisional Patent Application Serial No. 62 / 019,887 filed July 2, 2014, U.S. Provisional Patent Application Serial No. 62 / 021,618 filed July 7, 2014, and U.S. Provisional Patent Application Serial No. 62 / 021,618 filed July 1, 2015. Priority of Provisional Patent Application Serial No. 14 / 789,071, each of which is hereby incorporated by reference in its entirety. technical field [0003] This written document relates generally to MEMS accelerometers, and more particularly, to MEMS accelerometer assemblies with enhanced resistance to mechanical shock, and related methods, devices, and systems. Background technique [0004] Accelerometers have become ubiquitous in modern electronics. In this regard, measuring acceleration along three orthogonal axes can provide a substantially complete characterization of the orientation of the device. Accelerometers configured to measure acceleration along three orthogonal axes...

AI Technical Summary

Problems solved by technology

As will be described in detail below, it has been recognized that the use of consumer-grade low-cost accelerometers in devices that subject the accelerometers to mechanical shock and vibration environments can cause failure of these devices

While the overall failure rate has historically been low, any premature failure of a transmitter will cause significant problems, including idling personnel and equipment while obtaining a new transmitter, missing deadlines, and delays in purchasing new transmitters. costs involved

To date, the industry continues to use these accelerometers due to the lack of approved, practical alternatives

Images